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Insects (from Latin insectum) are hexapod invertebrates of the class Insecta. They are the largest group within the arthropod phylum. Insects have a chitinous exoskeleton, a three-part body (head, thorax and abdomen), three pairs of jointed legs, compound eyes.
The word mosquito (formed by mosca and diminutive-ito) is Spanish and Portuguese for little fly. Mosquitoes have a slender segmented body, one pair of wings, three pairs of long hair-like legs, and specialized, highly elongated, piercing-sucking mouthparts.
Insect morphology is the study and description of the physical form of insects. The terminology used to describe insects is similar to that used for other arthropods due to their shared evolutionary history.
An Anopheles stephensi mosquito drinking human blood. The species carries malaria. Dipterans are an important group of insects and have a considerable impact on the environment.
Beetles are insects that form the order Coleoptera ( / koʊliːˈɒptərə / ), in the superorder Holometabola. Their front pair of wings are hardened into wing-cases, elytra, distinguishing them from most other insects.
Insects diversified in only about 100 million years into essentially modern forms. Insect evolution is characterized by rapid adaptation due to selective pressures exerted by the environment and furthered by high fecundity.
Insect biodiversity. Insect biodiversity accounts for a large proportion of all biodiversity on the planet—over half of the estimated 1.5 million organism species described are classified as insects. [1] [2] A pie chart of described eukaryote species, showing just over half of these to be insects.
